P.S. I found an entry about this tree in Wikipedia today (24. Oct.).
In English it is "Beautyberry".
http://en.wikipedia.org/wiki/Beautyberry.
According to this site, "Japanese Beautyberry Callicarpa japonica, native to Japan, is also cultivated in gardens. It is called Murasakishikibu in Japanese, in honor of Murasaki Shikibu."